Air pollution is a health problem in a lot of cities, but certain days are definitely worse than others. This interactive map lets you check always-up-to-date local air reports for cities all over the world.

Cities have plenty of forageable food available, from plants that grow as weeds to fruit trees and bushes that were either abandoned, or were planted just for looks. But is this food too polluted to eat? Probably not, according to two teams of scientists who have tested it.